a motorcyclist drives from a to b with a uniform speed of 30km/hr and returns back with a speed of 20km/hr . find its average speed
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Let distance = x
Total Distance = x + x = 2x
Time = x / 20 + x/ 30 = 5x / 60
Average Speed = Total Distance / Total Time
2x / (5x /60) = 2x * 60 / 5x = 25 km
Total Distance = x + x = 2x
Time = x / 20 + x/ 30 = 5x / 60
Average Speed = Total Distance / Total Time
2x / (5x /60) = 2x * 60 / 5x = 25 km
Answered by
0
let the distance from a to b is d then total distance travelled is 2d and total time taken is d/30+ d/20 & here is the ans 24km/hr
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